Real-time river flooding
across America.
Live USGS streamgauge readings, FEMA flood zones, NWS flood watches and warnings, and historical context — one map, refreshed throughout the day. Built for flood researchers, emergency managers, and outdoor recreationists.
What's happening right now
An AI-generated daily summary stitched from active streamgauge readings, NWS warnings, and watershed status.
A perfect storm of weather disasters is unfolding across the United States as Tropical Storm Bertha threatens the Gulf Coast while unprecedented flooding devastates communities from Connecticut to Texas. Multiple watersheds are experiencing extreme flooding conditions, with some areas recording streamflow levels exceeding 100,000% of normal—a catastrophic situation that emergency officials are calling historic. The convergence of Tropical Storm Bertha's heavy rainfall with already saturated ground from recent severe weather has created life-threatening flood conditions affecting millions of Americans, prompting widespread evacuations and emergency declarations across multiple states.
The most severe flooding is concentrated in several critical areas. In Texas, communities near the Frio River are facing apocalyptic conditions with streamflow at 105,941% of normal—over 1,000 times typical levels. The Agua Fria River region near Phoenix, Arizona is experiencing similarly catastrophic flooding at 60,465% of normal capacity. Connecticut's Quinnipiac River basin, including areas around New Haven, is overwhelmed at 2,330% of normal, causing extensive road flooding and infrastructure damage. In West Virginia, the Tygart Valley near Elkins is seeing devastating floods at 11,919% of normal, with the Buckhannon River area recording 9,512% of normal streamflow. These extreme conditions have turned roads into rivers, submerged homes, and isolated entire communities. Meanwhile, Ohio communities along the Little Muskingum and Muskingum Rivers near Marietta face critical flooding with levels reaching 13,088% and 3,472% of normal respectively.
As Tropical Storm Bertha churns toward a Louisiana landfall, Gulf Coast communities from Pensacola to Galveston are bracing for additional flooding impacts. New Orleans, still recovering from previous storms, faces the dual threat of street flooding and storm surge. Emergency operations centers have been activated across Louisiana, Mississippi, Alabama, and the Florida Panhandle, with officials distributing sandbags and urging residents to prepare for flash flooding. The storm's slow movement means prolonged rainfall—potentially 6-10 inches in some areas—which will compound existing flood emergencies. Authorities warn that the combination of saturated soils, overwhelmed drainage systems, and Bertha's heavy rainfall creates an exceptionally dangerous situation. Residents in all affected areas should monitor local emergency alerts, avoid flooded roadways, and be prepared to evacuate immediately if ordered by authorities.
Rivers currently flooding or rising
Live USGS streamgauge readings aggregated by river. Percent-of-normal compares current flow to the seasonal average.
| River | Observed (cfs) | Seasonal avg (cfs) | vs. Normal |
|---|---|---|---|
| Neosho River | 249 | 25 | ↑ 996% of normal |
| Clarion River | 2,210 | 269 | ↑ 823% of normal |
| Black Warrior River | 6,780 | 3,980 | ↑ 170% of normal |
| Hawlings River | 826 | 12 | ↑ 7000% of normal |
| Nueces River | 19,500 | 164 | ↑ 11890% of normal |
| Sabinal River | 249 | 6 | ↑ 4062% of normal |
| Frio River | 8,380 | 8 | ↑ 105942% of normal |
| Mill River | 317 | 14 | ↑ 2331% of normal |
| Still River | 603 | 48 | ↑ 1256% of normal |
| Salt River | 930 | 57 | ↑ 1632% of normal |
| Lampasas River | 170 | 9 | ↑ 1858% of normal |
| Delaware River | 1,790 | 189 | ↑ 950% of normal |
| Santa Cruz River | 558 | 1 | ↑ 94576% of normal |
| Pootatuck River | 267 | 13 | ↑ 2136% of normal |
| Nolin River | 2,850 | 248 | ↑ 1149% of normal |
| Pecos River | 1,810 | 0 | ↑ 3016667% of normal |
| Agua Fria River | 1,040 | 2 | ↑ 60465% of normal |
| Little Shenango River | 322 | 37 | ↑ 870% of normal |
| Duck River | 5,440 | 492 | ↑ 1106% of normal |
| Blackwater River | 1,180 | 54 | ↑ 2185% of normal |
| Wild Rice River | 29 | 102 | 28% of normal |
| Coginchaug River | 185 | 9 | ↑ 2056% of normal |
| Rippowam River | 182 | 8 | ↑ 2193% of normal |
| Cedar River | 29 | 93 | 31% of normal |
| Norwalk River | 184 | 12 | ↑ 1533% of normal |
| Tombigbee River | 22,140 | 23,630 | 94% of normal |
| Little Colorado River | 2,390 | 279 | ↑ 857% of normal |
| Guadalupe River | 390 | 33 | ↑ 1166% of normal |
| Little Muskingum River | 4,590 | 36 | ↑ 12750% of normal |
| North Anna River | 1,050 | 59 | ↑ 1768% of normal |
| Green River | 179 | 4 | ↑ 4735% of normal |
| Buckhannon River | 11,700 | 123 | ↑ 9512% of normal |
| Samish River | 27 | 34 | 78% of normal |
| Salmon River | 358 | 30 | ↑ 1201% of normal |
| Leona River | 253 | 13 | ↑ 1931% of normal |
| Saugatuck River | 589 | 19 | ↑ 3100% of normal |
| Youghiogheny River | 776 | 52 | ↑ 1492% of normal |
| Eightmile River | 220 | 6 | ↑ 3860% of normal |
| East Verde River | 160 | 11 | ↑ 1524% of normal |
| Casselman River | 160 | 18 | ↑ 899% of normal |
| Middle Fork River | 12,500 | 50 | ↑ 24950% of normal |
41 rivers are running elevated right now. Create a free account to see the full list, follow your rivers, and get alerts.
Create Free AccountWatersheds running elevated
Aggregated by HUC8 watershed code. Useful for catchment-level flood-risk assessment.
| HUC8 code | Watershed | Observed (cfs) | vs. Normal |
|---|---|---|---|
| h03160106 | Middle Tombigbee-Lubbub | 7,780 | ↑ 187% |
| h01080205 | Lower Connecticut | 1,141 | ↑ 2228% |
| h01100005 | Housatonic | 870 | ↑ 1438% |
| h07120004 | Des Plaines | 277 | 83% |
| h05090202 | Little Miami | 408 | ↑ 1347% |
| h13060001 | Pecos Headwaters | 1,810 | ↑ 3016667% |
| h01100006 | Saugatuck | 955 | ↑ 2430% |
| h05030201 | Little Muskingum-Middle Island | 17,290 | ↑ 13089% |
| h12110108 | Lower Frio | 5,020 | ↑ 1024490% |
| h15020016 | Lower Little Colorado | 2,390 | ↑ 857% |
| h12040104 | Buffalo-San Jacinto | 204 | ↑ 2914% |
| h01100004 | Quinnipiac | 317 | ↑ 2331% |
| h05040006 | Licking | 815 | ↑ 1269% |
| h12110106 | Upper Frio | 3,862 | ↑ 14492% |
| h05010005 | Clarion | 2,210 | ↑ 823% |
| h05010004 | French | 184 | ↑ 1278% |
| h05010006 | Middle Allegheny-Redbank | 4,715 | ↑ 921% |
| h12110103 | Upper Nueces | 19,500 | ↑ 11890% |
| h17110002 | Strait Of Georgia | 27 | 78% |
| h06040003 | Lower Duck | 5,440 | ↑ 1106% |
| h05090201 | Ohio Brush-Whiteoak | 742 | ↑ 1942% |
| h14080202 | Mcelmo | 236 | ↑ 673% |
| h08010211 | Horn Lake-Nonconnah | 1,110 | ↑ 22653% |
| h08010210 | Wolf | 308 | ↑ 14000% |
| h02040104 | Middle Delaware-Mongaup-Brodhead | 199 | ↑ 765% |
| h05060001 | Upper Scioto | 2,522 | ↑ 862% |
| h05140201 | Lower Ohio-Little Pigeon | 152 | ↑ 1768% |
| h15050202 | Upper San Pedro | 211 | ↑ 1648% |
| h05030106 | Upper Ohio-Wheeling | 3,870 | ↑ 3282% |
| h12100304 | Cibolo | 1,224 | ↑ 10457% |
| h05130103 | Upper Cumberland-Lake Cumberland | 1,230 | ↑ 3154% |
| h12030108 | Richland | 466 | ↑ 5210% |
| h05030102 | Shenango | 322 | ↑ 870% |
| h12060202 | Middle Brazos-Lake Whitney | 289 | ↑ 11560% |
| h03080103 | Lower St. Johns | 55,387 | 50% |
| h05140102 | Salt | 8,186 | ↑ 2720% |
| h07080105 | South Skunk | 584 | ↑ 779% |
| h03160201 | Middle Tombigbee-Chickasaw | 14,360 | 74% |
| h10270103 | Delaware | 1,790 | ↑ 950% |
| h15060203 | Lower Verde | 160 | ↑ 1524% |
| h15060202 | Upper Verde | 219 | ↑ 99545% |
| h15060103 | Upper Salt | 958 | ↑ 8858% |
| h07100008 | Lake Red Rock | 453 | ↑ 2265% |
| h03160113 | Lower Black Warrior | 6,780 | ↑ 170% |
| h10290101 | Upper Marais Des Cygnes | 533 | ↑ 1523% |
| h05020006 | Youghiogheny | 936 | ↑ 1341% |
| h05020004 | Cheat | 1,180 | ↑ 2185% |
| h05020005 | Lower Monongahela | 400 | ↑ 658% |
| h05020003 | Upper Monongahela | 521 | ↑ 1303% |
| h05020001 | Tygart Valley | 25,042 | ↑ 11919% |
| h05050009 | Coal | 1,490 | ↑ 656% |
| h12070203 | Lampasas | 170 | ↑ 1858% |
| h02060006 | Patuxent | 826 | ↑ 7000% |
| h12100201 | Upper Guadalupe | 390 | ↑ 1166% |
| h11070201 | Neosho Headwaters | 249 | ↑ 996% |
| h15050301 | Upper Santa Cruz | 558 | ↑ 94576% |
| h12100303 | Lower San Antonio | 5,810 | ↑ 3835% |
| h05050005 | Gauley | 399 | ↑ 1663% |
| h08080102 | Bayou Teche | 1,120 | ↑ 1310% |
| h09020105 | Western Wild Rice | 29 | 28% |
| h15070102 | Agua Fria | 1,040 | ↑ 60465% |
| h09020201 | Devils Lake | 227 | ↑ 1335% |
| h11140302 | Lower Sulphur | 1,270 | ↑ 3273% |
| h03180002 | Middle Pearl-Strong | 435 | ↑ 7909% |
| h05110002 | Barren | 1,750 | ↑ 2632% |
| h05110001 | Upper Green | 4,590 | ↑ 1185% |
| h05040004 | Muskingum | 691 | ↑ 3472% |
| h05040005 | Wills | 585 | ↑ 5177% |
| h05030203 | Little Kanawha | 1,640 | ↑ 3990% |
| h05110005 | Lower Green | 189 | ↑ 3024% |
| h05100102 | South Fork Licking | 2,630 | ↑ 1212% |
| h12070205 | San Gabriel | 397 | ↑ 6476% |
| h05140104 | Blue-Sinking | 196 | ↑ 869% |
| h02080106 | Pamunkey | 1,050 | ↑ 1768% |
| h05140103 | Rolling Fork | 1,310 | ↑ 757% |
| h05140101 | Silver-Little Kentucky | 196 | ↑ 817% |
| h05130202 | Lower Cumberland-Sycamore | 4,860 | ↑ 607% |
| h02020005 | Schoharie | 370 | ↑ 1542% |
| h08020203 | Lower St. Francis | 2,340 | ↑ 727% |
| h17110012 | Lake Washington | 22 | 67% |
80 watersheds are running elevated. Create a free account to see every basin.
Create Free AccountMonitoring & response toolkit
Everything on this page links into Snoflo’s gauge-level data — drill from a national view down to the readings on a single river.
Gauge-level flow reports
Every USGS streamgauge by state — live discharge, gage height, NWS flood stages, and the complete observation history.
Browse gauges →15-day flow forecasts
PULSE probabilistic outlooks on every gauge — median, likely range, and projected stage, refreshed daily.
How PULSE works →Engineering data & reports
Flow-duration statistics, observed peak context, CSV exports, and printable conditions reports for any gauge and date range.
Snoflo for Engineering →Interactive national map
Layer gauges, warnings, watersheds, rain, and recreation across the country on one map.
Open the map →What causes river flooding
Flooding is rarely a single-cause event — multiple factors usually compound. The most common drivers across the U.S.
Heavy rainfall
Persistent rain saturates soils and overwhelms drainage networks. Tropical systems and atmospheric rivers are the worst culprits.
Rapid snowmelt
Spring melt pulses can deliver months of accumulated water in days — especially when warm rain falls on existing snowpack.
Ice jams
Breakup ice can block channels, forcing water to back up and inundate upstream banks. Common on northern rivers in early spring.
Storm surge
Coastal hurricanes push seawater inland. Surge combined with rainfall is the deadliest flood scenario in U.S. history.
Reservoir releases
Controlled dam releases can dramatically increase downstream flow. USACE and USBR publish release schedules, but conditions change fast.
Burn scars
Wildfire-stripped slopes can't absorb rainfall — even modest storms produce dangerous flash floods on burned watersheds for years afterward.
Flood preparedness checklist
Floodwaters rise faster than most people expect. The basics that save lives.
Flood map & river monitoring FAQ
What does "percent of normal" mean?
The current flow at a gauge compared to its seasonal average for this date. 100% means flow is right at the historical norm. 200%+ means twice the typical flow — a strong indicator of flood conditions on small-to-medium rivers. Every gauge-level flow report shows its live percent-of-normal.
What's the difference between a flood watch and a flood warning?
Watch: conditions are favorable for flooding within the next 12–48 hours. Warning: flooding is happening or imminent. Both come from the National Weather Service. Snoflo overlays both as toggleable layers on the map above.
How often does Snoflo's data refresh?
USGS streamgauge readings update every 15 minutes; we re-pull every hour. NWS warning polygons update as the NWS issues them — usually within 5 minutes. FEMA flood zones are static (the National Flood Hazard Layer is updated quarterly).
What is the FEMA flood zone layer?
FEMA's National Flood Hazard Layer (NFHL) shows the 1%-annual-chance ("100-year") and 0.2%-annual-chance ("500-year") floodplains. These are based on long-term hydrologic modeling, not current conditions. Useful for property risk; not a real-time signal.
Can I get an alert when my local river floods?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a threshold (e.g. "alert me at 20 ft stage"), and you'll get a push the moment it crosses. Free with a Snoflo account.
Is Snoflo a substitute for official warnings?
No. Snoflo is informational. For life-safety decisions always follow guidance from local emergency management, the NWS, and law enforcement.
Track river flooding in real time
Create your free account to monitor flood conditions across America — and watch the rivers you care about.
- Flood alerts — get pinged the moment a river near you crosses flood stage
- Save your rivers — watch any gauge or watershed in one place
- Full history & forecasts — plus the free iPhone app